TROJ_VBINJECT.XG
Windows 2000, Windows XP, Windows Server 2003
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Trojan
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
This Trojan may be dropped by other malware.
TECHNICAL DETAILS
Arrival Details
This Trojan may be dropped by the following malware:
- TROJ_DROPPER.ZGD
Installation
This Trojan drops the following copies of itself into the affected system:
- %System%\Windupdt\winupdate.exe
(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)
It creates the following folders:
- %System%\Windupdt
(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)
It terminates the execution of the copy it initially executed and executes the copy it drops instead.
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
winupdater = "%System%\Windupdt\winupdate.exe"
It modifies the following registry entries to ensure it automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
Userinit = "%System%\userinit.exe,%System%\Windupdt\winupdate.exe"
(Note: The default value data of the said registry entry is %System%\userinit.exe,.)
Other System Modifications
This Trojan adds the following registry keys as part of its installation routine:
HKEY_CURRENT_USER\Software\DC3_FEXEC
Dropping Routine
This Trojan drops the following file(s), which it uses for its keylogging routine:
- %User Temp%\dclogs.sys
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.)
Stolen Information
This Trojan sends the gathered information via HTTP POST to the following URL:
- {BLOCKED}.no-ip.org
NOTES:
This Trojan hooks the following APIs:
- CloseHandle
- DeleteFileA
- ExitProcess
- FindClose
- FindFirstFileA
- GetCurrentDirectoryA
- GetExitCodeProcess
- GetTempPathA
- OpenProcess
- SetCurrentDirectoryA
- Sleep
- WaitForSingleObject
SOLUTION
Step 1
For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.
Step 3
Identify and delete files detected as TROJ_VBINJECT.XG using either the Startup Disk or Recovery Console
Step 4
Delete this registry key
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry. Before you could do this, you must restart in Safe Mode. For instructions on how to do this, you may refer to this page If the preceding step requires you to restart in safe mode, you may proceed to edit the system registry.
- In HKEY_CURRENT_USER\Software
- DC3_FEXEC
- DC3_FEXEC
Step 5
Delete this registry value
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- winupdater = "%System%\Windupdt\winupdate.exe"
- winupdater = "%System%\Windupdt\winupdate.exe"
Step 6
Restore this modified registry value
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
- From: Userinit = "%System%\userinit.exe,%System%\Windupdt\winupdate.exe"
To: Userinit = "%System%\userinit.exe,"
- From: Userinit = "%System%\userinit.exe,%System%\Windupdt\winupdate.exe"
Step 7
Search and delete this folder
- %System%\Windupdt
Step 8
Search and delete this file
- %User Temp%\dclogs.sys
Step 9
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_VBINJECT.XG. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.
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